San Pedro Weather Records (MXN00027040)

Record envelope, standing records and threshold days for San Pedro (MXN00027040), Mexico, with 66 years of record.

Key Facts for San Pedro

San Pedro (MXN00027040) is a weather station in Mexico at 17.78 latitude and -91.15 longitude, 44 m (144 ft) above sea level.
The station reports from 1948 to 2013, 66 years of record.
1,464 records set at San Pedro still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Pedro set a daily record precipitation of 5.8 mm (0.23 in) on 27 March 2013.

About the Station

Location: Mexico, 17.78 latitude, -91.15 longitude.
Elevation: 44 m (144 ft).
Period of record: 1948 to 2013, 66 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at San Pedro. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at San Pedro, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.3 C (100.9 F)	7.2 C (45.0 F)	n/a	n/a
Feb	40.6 C (105.1 F)	8.9 C (48.0 F)	n/a	n/a
Mar	44.4 C (111.9 F)	10.0 C (50.0 F)	n/a	n/a
Apr	45.0 C (113.0 F)	12.8 C (55.0 F)	n/a	n/a
May	45.0 C (113.0 F)	15.0 C (59.0 F)	n/a	n/a
Jun	43.9 C (111.0 F)	17.2 C (63.0 F)	n/a	n/a
Jul	40.0 C (104.0 F)	16.1 C (61.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	16.7 C (62.1 F)	n/a	n/a
Sep	41.1 C (106.0 F)	16.7 C (62.1 F)	n/a	n/a
Oct	39.4 C (102.9 F)	12.8 C (55.0 F)	n/a	n/a
Nov	40.6 C (105.1 F)	10.6 C (51.1 F)	n/a	n/a
Dec	37.2 C (99.0 F)	7.8 C (46.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Pedro still stand. 1989 holds the most, with 246.

Standing records at San Pedro by the year they were set
Year set	Standing records
1948	4
1949	16
1952	13
1953	28
1954	15
1955	20
1956	21
1957	14
1958	28
1959	18
1960	23
1961	12
1962	20
1963	13
1964	23
1965	12
1966	13
1967	9
1968	14
1969	22
1970	21
1971	11
1972	5
1973	30
1974	13
1975	7
1976	11
1977	16
1978	13
1979	14
1980	17
1981	8
1982	6
1983	20
1984	13
1985	10
1986	18
1987	37
1988	37
1989	246
1990	19
1992	7
1993	16
1994	10
1995	24
1996	22
1997	26
1998	87
1999	20
2000	23
2001	25
2002	22
2003	34
2004	32
2005	58
2006	35
2007	16
2008	8
2009	18
2010	19
2011	26
2012	13
2013	13

All-Time Record Progression

10 new records

10 all-time records were set at San Pedro between 22 September 1982 and 9 August 2012. Each dot is a new record.

When San Pedro set new all-time records
Date	Kind	Detail
1982-09-22	Record daily precipitation	Record daily precipitation 160.3 mm (6.3 in)
1985-01-05	Record low maximum temperature	Record low maximum temperature 17.2 C (63.0 F)
1989-12-14	Record low maximum temperature	Record low maximum temperature 16.7 C (62.1 F)
1989-12-23	Record low maximum temperature	Record low maximum temperature 16.1 C (61.0 F)
1998-06-05	Record high maximum temperature	Record high maximum temperature 43.9 C (111.0 F)
2005-03-22	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
2005-04-26	Record high maximum temperature	Record high maximum temperature 45.0 C (113.0 F)
2010-06-04	Record high minimum temperature	Record high minimum temperature 26.7 C (80.1 F)
2010-06-28	Record daily precipitation	Record daily precipitation 171.5 mm (6.8 in)
2012-08-09	Record daily precipitation	Record daily precipitation 273.6 mm (10.8 in)

Wettest Day of Each Month

Aug: 273.6 mm (10.8 in)

The wettest day on record for each calendar month at San Pedro. The most was 273.6 mm (10.8 in) on 9 August 2012.

Record daily precipitation for each month at San Pedro
Month	Record daily precipitation (mm)	Date
Jan	63.0 mm (2.5 in)	17 January 1957
Feb	134.9 mm (5.3 in)	23 February 1990
Mar	103.9 mm (4.1 in)	11 March 1987
Apr	83.6 mm (3.3 in)	3 April 1992
May	151.9 mm (6.0 in)	7 May 1960
Jun	171.5 mm (6.8 in)	28 June 2010
Jul	74.9 mm (2.9 in)	5 July 1996
Aug	273.6 mm (10.8 in)	9 August 2012
Sep	160.3 mm (6.3 in)	22 September 1982
Oct	157.0 mm (6.2 in)	1 October 1987
Nov	126.5 mm (5.0 in)	26 November 1980
Dec	80.5 mm (3.2 in)	20 December 1961

Period of Record Coverage

1948 to 2013

63 years of record at San Pedro, 1948 to 2013. 8 years have data for under 90 percent of days and are left out of rankings: 1948, 1952, 1954, 1990, 1992, 1998, 2010, 2013.

Days with data per year at San Pedro
Year	Days with data	Share of year	Complete
1948	134	37%	No
1949	365	100%	Yes
1952	153	42%	No
1953	365	100%	Yes
1954	306	84%	No
1955	363	99%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	363	99%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	363	99%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	362	99%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	364	100%	Yes
1984	335	92%	Yes
1985	364	100%	Yes
1986	362	99%	Yes
1987	365	100%	Yes
1988	362	99%	Yes
1989	363	99%	Yes
1990	301	82%	No
1992	122	33%	No
1993	364	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	335	92%	Yes
1998	245	67%	No
1999	364	100%	Yes
2000	365	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	364	100%	Yes
2007	334	92%	Yes
2008	366	100%	Yes
2009	364	100%	Yes
2010	273	75%	No
2011	335	92%	Yes
2012	335	92%	Yes
2013	90	25%	No

Latest Records

Latest records at San Pedro
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 March 2013	San Pedro, MX	daily rain	5.8 mm (0.23 in)	3.5 mm (0.14 in)	58 years	20 of 100 (Routine)
25 March 2013	San Pedro, MX	daily high min	25.0 C (77.0 F)	1.1 C (2.0 F)	35 years	20 of 100 (Routine)
24 March 2013	San Pedro, MX	daily high min	25.0 C (77.0 F)	1.7 C (3.1 F)	44 years	26 of 100 (Routine)
21 March 2013	San Pedro, MX	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	48 years	22 of 100 (Routine)
20 March 2013	San Pedro, MX	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	50 years	23 of 100 (Routine)
13 March 2013	San Pedro, MX	daily rain	10.7 mm (0.4 in)	7.1 mm (0.28 in)	32 years	19 of 100 (Routine)
5 March 2013	San Pedro, MX	daily low min	12.2 C (54.0 F)	0.6 C (1.1 F)	4 years	9 of 100 (Routine)
4 March 2013	San Pedro, MX	daily low min	12.2 C (54.0 F)	0.6 C (1.1 F)	32 years	17 of 100 (Routine)
3 March 2013	San Pedro, MX	daily low max	23.3 C (73.9 F)	0.6 C (1.1 F)	32 years	16 of 100 (Routine)
25 February 2013	San Pedro, MX	daily high min (Tie)	21.7 C (71.1 F)	tie	53 years	5 of 100 (Routine)
7 February 2013	San Pedro, MX	daily high min (Tie)	21.1 C (70.0 F)	tie	52 years	5 of 100 (Routine)
5 February 2013	San Pedro, MX	daily low max	22.2 C (72.0 F)	0.6 C (1.1 F)	35 years	17 of 100 (Routine)
28 January 2013	San Pedro, MX	daily high min (Tie)	20.6 C (69.1 F)	tie	34 years	4 of 100 (Routine)
19 January 2013	San Pedro, MX	daily low max	20.0 C (68.0 F)	0.6 C (1.1 F)	36 years	17 of 100 (Routine)
13 January 2013	San Pedro, MX	daily high min (Tie)	20.6 C (69.1 F)	tie	39 years	4 of 100 (Routine)
12 January 2013	San Pedro, MX	daily high min	21.1 C (70.0 F)	0.5 C (0.9 F)	44 years	21 of 100 (Routine)
11 January 2013	San Pedro, MX	daily high min	22.2 C (72.0 F)	1.6 C (2.9 F)	30 years	22 of 100 (Routine)
10 January 2013	San Pedro, MX	daily high min	21.7 C (71.1 F)	1.1 C (2.0 F)	30 years	19 of 100 (Routine)
9 January 2013	San Pedro, MX	daily high min (Tie)	20.6 C (69.1 F)	tie	40 years	4 of 100 (Routine)
7 January 2013	San Pedro, MX	daily rain	32.8 mm (1.3 in)	9.4 mm (0.37 in)	17 years	20 of 100 (Routine)

Climate Trend

50 complete years, 1949 to 2009

One stripe for each of 50 complete years at San Pedro, 1949 to 2009. Blue stripes are years cooler than the station's own mean of 26.6 C (79.8 F); red stripes are warmer. The coolest year was 1989, at 22.7 C (72.9 F), and the warmest was 2005, at 28.5 C (83.2 F). The strongest colour marks a difference of 3.9 C (7.0 F).

Annual mean temperature at San Pedro as warming stripes, 1949 to 2009
Year	Annual mean temperature	Difference from the station mean
1949	26.4 C	-0.21 C
1953	26.3 C	-0.23 C
1955	26.2 C	-0.34 C
1956	25.8 C	-0.73 C
1957	26.4 C	-0.21 C
1958	26.5 C	-0.04 C
1959	26.2 C	-0.34 C
1960	26.6 C	-0.02 C
1961	26.2 C	-0.42 C
1962	26.0 C	-0.57 C
1963	26.1 C	-0.52 C
1964	26.2 C	-0.35 C
1965	26.2 C	-0.33 C
1966	26.0 C	-0.62 C
1967	26.2 C	-0.38 C
1968	25.8 C	-0.78 C
1969	26.5 C	-0.04 C
1970	26.1 C	-0.50 C
1971	26.7 C	+0.15 C
1972	26.9 C	+0.33 C
1973	26.6 C	+0.03 C
1974	26.3 C	-0.27 C
1975	26.8 C	+0.22 C
1976	25.8 C	-0.75 C
1977	26.4 C	-0.18 C
1978	26.4 C	-0.22 C
1979	26.4 C	-0.13 C
1980	26.7 C	+0.11 C
1981	26.5 C	-0.04 C
1982	26.4 C	-0.13 C
1983	26.6 C	+0.06 C
1985	25.6 C	-0.93 C
1986	25.0 C	-1.56 C
1987	25.0 C	-1.60 C
1988	25.2 C	-1.37 C
1989	22.7 C	-3.84 C
1993	27.2 C	+0.63 C
1994	27.3 C	+0.75 C
1995	27.5 C	+0.92 C
1996	27.3 C	+0.71 C
1999	27.6 C	+1.07 C
2000	28.1 C	+1.57 C
2001	28.0 C	+1.46 C
2002	27.8 C	+1.26 C
2003	28.3 C	+1.75 C
2004	27.9 C	+1.31 C
2005	28.5 C	+1.90 C
2006	28.1 C	+1.52 C
2008	27.2 C	+0.64 C
2009	27.8 C	+1.23 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1949 to 2009. In Fahrenheit: 0.5 F (0.3 to 0.8) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Pedro
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.1 to 0.4) per decade	0.5 F (0.3 to 0.8) per decade	1949 to 2009	50	Rise
Mean daily maximum	0.5 C (0.2 to 0.7) per decade	0.8 F (0.4 to 1.2) per decade	1949 to 2009	50	Rise
Mean daily minimum	0.13 C (0.02 to 0.23) per decade	0.23 F (0.04 to 0.41) per decade	1949 to 2009	50	Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1948 to 2013

Yearly extremes at San Pedro: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.0 C (113.0 F)	2005	40.6 C (105.1 F)	63
Coldest night (TNn)	7.2 C (45.0 F)	1954	11.7 C (53.1 F)	63
Wettest day (Rx1day)	273.6 mm (10.8 in)	2012	89.4 mm (3.5 in)	64
Wettest five days (Rx5day)	342.1 mm (13.5 in)	1967	160.6 mm (6.3 in)	64
Longest dry spell (CDD)	81 days	1991	30 days	64

Hottest day (TXx)

The hottest day of the year at San Pedro, 1948 to 2013. The record is 45.0 C (113.0 F) in 2005, marked on the chart; the median year is 40.6 C (105.1 F).

Hottest day (TXx) at San Pedro by year
Year	Hottest day (TXx)
1948	35.6 C (96.1 F)
1949	40.0 C (104.0 F)
1952	39.4 C (102.9 F)
1953	42.8 C (109.0 F)
1954	36.1 C (97.0 F)
1955	40.6 C (105.1 F)
1956	37.8 C (100.0 F)
1957	41.1 C (106.0 F)
1958	42.2 C (108.0 F)
1959	36.7 C (98.1 F)
1960	40.0 C (104.0 F)
1961	39.4 C (102.9 F)
1962	40.0 C (104.0 F)
1963	40.0 C (104.0 F)
1964	42.8 C (109.0 F)
1965	40.0 C (104.0 F)
1966	39.4 C (102.9 F)
1967	42.2 C (108.0 F)
1968	40.0 C (104.0 F)
1969	41.1 C (106.0 F)
1970	41.1 C (106.0 F)
1971	42.2 C (108.0 F)
1972	41.1 C (106.0 F)
1973	41.1 C (106.0 F)
1974	41.1 C (106.0 F)
1975	41.7 C (107.1 F)
1976	40.0 C (104.0 F)
1977	38.9 C (102.0 F)
1978	40.6 C (105.1 F)
1979	40.6 C (105.1 F)
1980	41.7 C (107.1 F)
1981	40.6 C (105.1 F)
1982	38.9 C (102.0 F)
1983	41.7 C (107.1 F)
1984	40.0 C (104.0 F)
1985	37.2 C (99.0 F)
1986	37.2 C (99.0 F)
1987	37.8 C (100.0 F)
1988	40.0 C (104.0 F)
1989	35.6 C (96.1 F)
1990	40.0 C (104.0 F)
1991	n/a
1992	37.2 C (99.0 F)
1993	40.0 C (104.0 F)
1994	39.4 C (102.9 F)
1995	41.1 C (106.0 F)
1996	40.0 C (104.0 F)
1997	40.6 C (105.1 F)
1998	43.9 C (111.0 F)
1999	43.3 C (109.9 F)
2000	43.3 C (109.9 F)
2001	42.8 C (109.0 F)
2002	40.6 C (105.1 F)
2003	43.3 C (109.9 F)
2004	41.7 C (107.1 F)
2005	45.0 C (113.0 F)
2006	45.0 C (113.0 F)
2007	43.3 C (109.9 F)
2008	42.8 C (109.0 F)
2009	42.2 C (108.0 F)
2010	42.2 C (108.0 F)
2011	41.7 C (107.1 F)
2012	40.0 C (104.0 F)
2013	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at San Pedro, 1948 to 2013. The record is 7.2 C (45.0 F) in 1954, marked on the chart; the median year is 11.7 C (53.1 F).

Coldest night (TNn) at San Pedro by year
Year	Coldest night (TNn)
1948	15.6 C (60.1 F)
1949	10.6 C (51.1 F)
1952	11.7 C (53.1 F)
1953	8.9 C (48.0 F)
1954	7.2 C (45.0 F)
1955	10.6 C (51.1 F)
1956	10.0 C (50.0 F)
1957	11.7 C (53.1 F)
1958	11.1 C (52.0 F)
1959	14.4 C (57.9 F)
1960	11.1 C (52.0 F)
1961	11.7 C (53.1 F)
1962	12.2 C (54.0 F)
1963	10.0 C (50.0 F)
1964	11.7 C (53.1 F)
1965	11.7 C (53.1 F)
1966	11.7 C (53.1 F)
1967	10.6 C (51.1 F)
1968	11.1 C (52.0 F)
1969	15.0 C (59.0 F)
1970	10.0 C (50.0 F)
1971	11.7 C (53.1 F)
1972	13.3 C (55.9 F)
1973	11.7 C (53.1 F)
1974	12.2 C (54.0 F)
1975	13.3 C (55.9 F)
1976	11.7 C (53.1 F)
1977	11.7 C (53.1 F)
1978	10.6 C (51.1 F)
1979	13.9 C (57.0 F)
1980	12.8 C (55.0 F)
1981	12.8 C (55.0 F)
1982	12.2 C (54.0 F)
1983	9.4 C (48.9 F)
1984	11.7 C (53.1 F)
1985	12.8 C (55.0 F)
1986	10.6 C (51.1 F)
1987	11.7 C (53.1 F)
1988	13.3 C (55.9 F)
1989	7.8 C (46.0 F)
1990	8.9 C (48.0 F)
1991	n/a
1992	15.0 C (59.0 F)
1993	12.8 C (55.0 F)
1994	13.3 C (55.9 F)
1995	13.3 C (55.9 F)
1996	11.7 C (53.1 F)
1997	12.2 C (54.0 F)
1998	15.0 C (59.0 F)
1999	12.8 C (55.0 F)
2000	12.8 C (55.0 F)
2001	11.7 C (53.1 F)
2002	10.6 C (51.1 F)
2003	12.8 C (55.0 F)
2004	14.4 C (57.9 F)
2005	12.8 C (55.0 F)
2006	11.7 C (53.1 F)
2007	14.4 C (57.9 F)
2008	15.0 C (59.0 F)
2009	11.7 C (53.1 F)
2010	11.1 C (52.0 F)
2011	14.4 C (57.9 F)
2012	13.9 C (57.0 F)
2013	12.2 C (54.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Pedro, 1948 to 2013. The record is 273.6 mm (10.8 in) in 2012, marked on the chart; the median year is 89.4 mm (3.5 in).

Wettest day (Rx1day) at San Pedro by year
Year	Wettest day (Rx1day)
1948	75.4 mm (3.0 in)
1949	26.4 mm (1.0 in)
1952	81.3 mm (3.2 in)
1953	78.0 mm (3.1 in)
1954	72.9 mm (2.9 in)
1955	132.8 mm (5.2 in)
1956	83.8 mm (3.3 in)
1957	67.3 mm (2.6 in)
1958	110.0 mm (4.3 in)
1959	115.8 mm (4.6 in)
1960	151.9 mm (6.0 in)
1961	80.5 mm (3.2 in)
1962	142.0 mm (5.6 in)
1963	134.4 mm (5.3 in)
1964	111.8 mm (4.4 in)
1965	80.8 mm (3.2 in)
1966	69.3 mm (2.7 in)
1967	136.9 mm (5.4 in)
1968	63.8 mm (2.5 in)
1969	61.0 mm (2.4 in)
1970	54.9 mm (2.2 in)
1971	60.5 mm (2.4 in)
1972	74.9 mm (2.9 in)
1973	87.9 mm (3.5 in)
1974	79.0 mm (3.1 in)
1975	80.5 mm (3.2 in)
1976	81.5 mm (3.2 in)
1977	120.9 mm (4.8 in)
1978	103.6 mm (4.1 in)
1979	104.9 mm (4.1 in)
1980	126.5 mm (5.0 in)
1981	74.7 mm (2.9 in)
1982	160.3 mm (6.3 in)
1983	68.8 mm (2.7 in)
1984	62.0 mm (2.4 in)
1985	107.4 mm (4.2 in)
1986	77.0 mm (3.0 in)
1987	157.0 mm (6.2 in)
1988	138.9 mm (5.5 in)
1989	127.0 mm (5.0 in)
1990	134.9 mm (5.3 in)
1991	96.3 mm (3.8 in)
1992	83.6 mm (3.3 in)
1993	75.9 mm (3.0 in)
1994	90.9 mm (3.6 in)
1995	149.9 mm (5.9 in)
1996	134.9 mm (5.3 in)
1997	93.0 mm (3.7 in)
1998	80.3 mm (3.2 in)
1999	83.3 mm (3.3 in)
2000	133.1 mm (5.2 in)
2001	71.4 mm (2.8 in)
2002	96.3 mm (3.8 in)
2003	77.5 mm (3.1 in)
2004	92.2 mm (3.6 in)
2005	128.0 mm (5.0 in)
2006	86.9 mm (3.4 in)
2007	116.3 mm (4.6 in)
2008	119.9 mm (4.7 in)
2009	72.9 mm (2.9 in)
2010	171.5 mm (6.8 in)
2011	130.8 mm (5.1 in)
2012	273.6 mm (10.8 in)
2013	46.0 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Pedro, 1948 to 2013. The record is 342.1 mm (13.5 in) in 1967, marked on the chart; the median year is 160.6 mm (6.3 in).

Wettest five days (Rx5day) at San Pedro by year
Year	Wettest five days (Rx5day)
1948	106.4 mm (4.2 in)
1949	73.1 mm (2.9 in)
1952	172.5 mm (6.8 in)
1953	171.5 mm (6.8 in)
1954	148.7 mm (5.9 in)
1955	194.8 mm (7.7 in)
1956	119.3 mm (4.7 in)
1957	114.8 mm (4.5 in)
1958	290.3 mm (11.4 in)
1959	171.7 mm (6.8 in)
1960	151.9 mm (6.0 in)
1961	100.8 mm (4.0 in)
1962	181.7 mm (7.2 in)
1963	234.2 mm (9.2 in)
1964	165.7 mm (6.5 in)
1965	109.6 mm (4.3 in)
1966	141.3 mm (5.6 in)
1967	342.1 mm (13.5 in)
1968	186.0 mm (7.3 in)
1969	122.0 mm (4.8 in)
1970	101.8 mm (4.0 in)
1971	130.8 mm (5.1 in)
1972	193.8 mm (7.6 in)
1973	181.3 mm (7.1 in)
1974	139.2 mm (5.5 in)
1975	137.4 mm (5.4 in)
1976	143.8 mm (5.7 in)
1977	237.5 mm (9.4 in)
1978	139.5 mm (5.5 in)
1979	159.7 mm (6.3 in)
1980	155.5 mm (6.1 in)
1981	136.2 mm (5.4 in)
1982	281.3 mm (11.1 in)
1983	102.9 mm (4.1 in)
1984	112.2 mm (4.4 in)
1985	127.5 mm (5.0 in)
1986	119.2 mm (4.7 in)
1987	164.1 mm (6.5 in)
1988	192.8 mm (7.6 in)
1989	153.5 mm (6.0 in)
1990	155.2 mm (6.1 in)
1991	157.6 mm (6.2 in)
1992	178.3 mm (7.0 in)
1993	168.1 mm (6.6 in)
1994	115.3 mm (4.5 in)
1995	170.2 mm (6.7 in)
1996	174.0 mm (6.9 in)
1997	216.2 mm (8.5 in)
1998	146.3 mm (5.8 in)
1999	146.6 mm (5.8 in)
2000	178.9 mm (7.0 in)
2001	156.8 mm (6.2 in)
2002	169.1 mm (6.7 in)
2003	189.1 mm (7.4 in)
2004	161.6 mm (6.4 in)
2005	231.6 mm (9.1 in)
2006	202.7 mm (8.0 in)
2007	172.3 mm (6.8 in)
2008	220.4 mm (8.7 in)
2009	137.4 mm (5.4 in)
2010	279.1 mm (11.0 in)
2011	255.0 mm (10.0 in)
2012	303.9 mm (12.0 in)
2013	63.0 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Pedro, 1948 to 2013. The record is 81 days in 1991, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at San Pedro by year
Year	Longest dry spell (CDD)
1948	16 days
1949	43 days
1952	13 days
1953	47 days
1954	12 days
1955	44 days
1956	49 days
1957	29 days
1958	52 days
1959	19 days
1960	39 days
1961	23 days
1962	33 days
1963	22 days
1964	32 days
1965	30 days
1966	22 days
1967	29 days
1968	21 days
1969	37 days
1970	20 days
1971	38 days
1972	36 days
1973	32 days
1974	39 days
1975	61 days
1976	30 days
1977	28 days
1978	28 days
1979	34 days
1980	22 days
1981	37 days
1982	26 days
1983	33 days
1984	25 days
1985	28 days
1986	34 days
1987	23 days
1988	24 days
1989	14 days
1990	25 days
1991	81 days
1992	25 days
1993	25 days
1994	27 days
1995	30 days
1996	32 days
1997	26 days
1998	38 days
1999	32 days
2000	59 days
2001	37 days
2002	32 days
2003	49 days
2004	34 days
2005	40 days
2006	18 days
2007	35 days
2008	38 days
2009	21 days
2010	20 days
2011	24 days
2012	39 days
2013	24 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

58 years, 1949 to 2012

A day with at least 96.3 mm (3.8 in) of rain is expected about once in 2 years. A day with at least 217.6 mm (8.6 in) of rain is expected about once in 100 years.

Rainfall return levels at San Pedro: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	96.3 mm (3.8 in)
5 years	128.6 mm (5.1 in)
10 years	150.1 mm (5.9 in)
25 years	177.3 mm (7.0 in)
50 years	197.5 mm (7.8 in)
100 years	217.6 mm (8.6 in)	Longer than the 58 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 58 years of values from 1949 to 2012.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 273.6 mm (10.8 in) in 2012; 160.3 mm (6.3 in) in 1982; 157.0 mm (6.2 in) in 1987.

Download the Data

Data for San Pedro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Pedro threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).